var prefsLoaded = false;
var defaultFontSize = 1;
var currentFontSize = defaultFontSize;

function revertStyles(){

	currentFontSize = defaultFontSize;
	changeFontSize(0);

}

function toggleColors(){
	if(currentStyle == "White"){
		setColor("Black");
	}else{
		setColor("White");
	}
}

function changeFontSize(sizeDifference){
	//alert ("Antes"+currentFontSize);
	currentFontSize = currentFontSize + (sizeDifference / 10);
	//alert ("Despues"+currentFontSize);
	if(currentFontSize > 1.5){
		currentFontSize = 1.5;
	}else if(currentFontSize < 1.0){

		currentFontSize = 1.0;
	}

	setFontSize(currentFontSize);
};

function setFontSize(fontSize){
	/*	alert ("fontSize"+fontSize);*/
	
	var stObj = (document.getElementById) ? document.getElementById('content_area') : document.all('content_area');
	document.body.style.fontSize = fontSize + 'em';
	

};

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
};

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
};

window.onload = setUserOptions;

function setUserOptions(){
	if(!prefsLoaded){

		cookie = readCookie("fontSize");
		currentFontSize = cookie ? cookie : defaultFontSize;
	//	alert ("Cookie"+currentFontSize);
		currentFontSize = parseFloat(currentFontSize);
		setFontSize(currentFontSize);
		
		prefsLoaded = true;
	}

}

window.onunload = saveSettings;

function saveSettings()
{
	//	alert ("saveSettings"+currentFontSize);
		createCookie("fontSize", currentFontSize, 365);
}